Deck 4: Structural Design and Analysis

Question 1

High strength concrete is used in prestressed member?

A)to ovecome bursting stresses at the ends
B)to provide high bond stresses
C)to overcome cracks due to shrinkage
D)to overcome bursting stresses, provide high bond stresses and overcome cracks

Answer 1

to overcome bursting stresses, provide high bond stresses and overcome cracks

Question 2

The advantage of reinforced concrete is due to______________            

A)monolithic character
B)moulding in any desired shape
C)fire-resisting and durability
D)monolithic character, moulding any shape and fire-resisting

Answer 2

monolithic character, moulding any shape and fire-resisting

Question 3

Cracking of the concrete section is nearly impossible to prevent.

Answer 3

True

Question 4

The architect is usually the lead designer on buildings, with a structural engineer employed as a sub-consultant.

Question 5

Why plate girder is preferred over truss girder?

A)plate girder requires costly maintenance
B)higher vertical clearance required for plate girder than truss girder
C)cost of fabrication of plate girder is high
D)cost of fabrication of truss girder is high

Question 6

Bending resistance of plate girders can be increased by

A)decreasing distance between flanges
B)increasing distance between flanges
C)reducing distance between flanges to half
D)bending resistance cannot be increased

Question 7

Which of the following is economical if depth is limited and loads are too large?

A)rolled section beam
B)truss girder
C)welded box plate girder
D)bolted box plate girder

Question 8

An ideal bolted plate girder section consists of

A)flange angles and cover plates for both compression flange and tension flange
B)flange angles and cover plates for compression flange and only flange angle for tension flange
C)only flange angle for compression flange and flange angles and cover plates for tension flange
D)flange angles for both compression flange and tension flange

Question 9

The modes of failure of plate girder are

A)by yielding of compression flange only
B)by buckling of tension flange only
C)by yielding of tension flange and buckling of compression flange
D)by yielding of compression flange and buckling of tension flange

Question 10

At high shear locations in the girder web, principal plane will be______________  to longitudinal axis of member

A)inclined
B)parallel
C)perpendicular
D)coincides

Question 11

Which of the following causes web buckling in plate girder?

A)diagonal tension
B)diagonal compression
C)diagonal tension and diagonal compression
D)neither diagonal tension nor diagonal compression

Question 12

Which of the following statement is correct for reducing web buckling due to diagonal compression?

A)not providing web stiffeners to increase shear strength
B)providing web stiffeners to reduce shear strength
C)increasing depth-to-thickness ratio
D)reducing depth-to-thickness ratio

Question 13

Which of the following is correct during tension field action?

A)web can resist diagonal compression
B)horizontal component of diagonal compression is supported by flanges
C)vertical component of diagonal compression is supported by flanges
D)vertical component of diagonal compression is supported by stiffeners

Question 14

Which of the statement is not true about intermediate stiffeners?

A)they reduce shear capacity of web
B)they improve shear capacity of web
C)they can be used to develop tension field action
D)their main purpose is to provide stiffness to the web

Question 15

Which of the following is correct regarding gantry girders?

A)it is laterally supported except at the columns
B)it is subjected to impact load
C)it should not be analysed for unsymmetrical bending
D)it is not subjected to longitudinal load

Question 16

Which of the following loads are not considered in the design of gantry girders?

A)longitudinal loads
B)gravity loads
C)lateral loads
D)wind loads

Question 17

The wheel load transferred from trolley to gantry girder is given by

A)w1 = [wt(lc+l1)]/(2lc)
B)w1 = [wt(lc-l1)](2lc)
C)w1 = [wt(lc-l1)]/(2lc)
D)w1 = [wt(lc+l1)]/( lc)

Question 18

The maximum wheel load is obtained when

A)crane crab is farthest to gantry girder
B)crane crab is closest to gantry girder
C)crane crab is not attached
D)crane crab is at mid span

Question 19

The bending moment due to dead load of girder is maximum at

A)one-third distance at span
B)two-third distance at span
C)end of span
D)centre of span

Question 20

The minimum recommended rise of trusses with Galvanised Iron sheets is

A)1 in 12
B)1 in 6
C)1 in 10
D)1 in 18

Question 21

The economic spacing of roof truss depends on

A)cost of purlins only
B)cost of purlins and cost of roof covering
C)dead loads
D)cost of roof covering and dead loads

Question 22

Which of the following is true for economic spacing?

A)cost of trusses should be equal to twice the cost of purlins
B)cost of trusses should be equal to twice the cost of purlins minus cost of roof coverings
C)cost of trusses should be equal to the cost of purlins plus cost of roof coverings
D)cost of trusses should be equal to twice the cost of purlins plus cost of roof coverings

Question 23

Which of the following load combination is not considered for design of roof trusses?

A)dead load + crane load
B)dead load + wind load
C)dead load + earthquake load
D)dead load + live load + wind load

Question 24

Live load for roof truss should not be less than

A)0.4kn/m²
B)0.2kn/m²
C)0.75kn/m²
D)0.8kn/m²

Question 25

Simple connections are used to transmit

A)forces
B)moments
C)stresses
D)both force and moment